Simple enough, eh? Also, this method call will include the Twitter
JavaScript into the page (it only does it once, even if you have multiple
buttons on the page). To put this wherever you'd like (i.e., your
header), then use the tweet_widgets_js_tag method. If you call
this method, it will place the tag wherever you call it from (and only
place it there; subsequent calls do nothing).

The gem also supports the custom Twitter share links. To generate one, use
the custom_tweet_button (aliased to custom_tweet_link
also) method:

<%= custom_tweet_button %>

This will generate a link that will link to the share page with the same
default options as the standard Tweet Button generator. You can customize
your custom link with text as the first argument, the same options as
tweet_button (with the exception of the count parameter,
which will be ignored) as the second, and HTML options as a third argument.
For example: